LFU in the SM predicts the former ratio to be unity with uncertainties less than \(1\%\)  [1]}, [2]}, [3]}, [4]}, [5]}. A deficit in this neutral-current transition has been observed consistently over the years in several experiments [6]}, [7]}, [8]}, [9]}, and LHCb recently updated their measurements [10]} that increased the significance of the deviation. Moreover, with yet another observed deviation in \(Br\left(B^0_s\rightarrow \mu ^+\mu ^- \right)\)  [11]}, [12]}, [13]}, [14]}, the combined significance of the deviation is uplifted to \(4.7\sigma \) . On the other hand, the \(R_{D^{(\ast )}}\)  ratio differs from unity due to the substantial mass difference between tauon and muon. An enhancement of this charged-current
transition is reported by several experimental measurements [15]}, [16]}, [17]}, [18]}, [19]}, which combinedly leads to approximately \(3\sigma \)  deviation from the SM value [20]}, [21]}, [20]}, [21]}.
